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Finding the Third Proportional to 428 and 653.75

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Solution

The third proportional to 428 and 653.75 is: 998.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    428 : 653.75 = 653.75 : x
  2. Step 2: Convert to fraction form
    428/653.75 = 653.75/x
  3. Step 3: Cross multiply
    428x = 653.75 × 653.75
  4. Step 4: Simplify right side
    428x = 427,389.06
  5. Step 5: Solve for x
    x = 427,389.06/428
  6. Step 6: Final answer
    x = 998.57

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.